update dev dependencies

Author: ecarriou

package-lock.json

@@ -54,9 +54,9 @@
   "devDependencies": {
     "chai": "4.3.4",
     "coveralls": "3.1.0",
-    "grunt": "1.4.0",
+    "grunt": "1.4.1",
     "grunt-browserify": "6.0.0",
-    "grunt-cli": "1.4.2",
+    "grunt-cli": "1.4.3",
     "grunt-contrib-clean": "2.0.0",
     "grunt-contrib-concat": "1.0.1",
     "grunt-contrib-uglify": "5.0.1",